The Yankee slugger’s health situation remains shrouded in mystery, even after a press conference and conference call with reporters on Wednesday. However, Giambi apparently crossed off a big question mark yesterday morning when he reluctantly denied he’s getting his tumor shrunk by radiation treatments.

The revelation came during an exclusive interview with The Post after he worked out for nearly two hours indoors at the team’s minor-league complex. He was told there has been speculation that radiation might be one of the therapies.

“No,” Giambi quickly replied.

No, it’s not?

“No. Well, I’m not getting into it. I’m not getting into it,” Giambi said uncomfortably as he hopped into a SUV and drove away from the team’s minor-league complex.

Giambi was in great spirits as he signed autographs and posed for pictures with fans. He even addressed a Post reporter by saying, “What’s up, big daddy?”

And he laughed when asked if, years from now, he will finally reveal all of the details about his two-month search for medical answers – possibly on a show such as ESPN’s SportsCentury.

“I don’t know,” he said with a chuckle. “I’m not worried about it right now.